Core fob pneumatic tibes and method of cohstbuctiira- same



P. B.'BOSWORTH. CORE FOR PNEUMATIC TIRES ANDHMETHOD 0F CONSTRUCTING SAME.

APPLICATION FILED JULY 8, 1920.

m WM Mr M 7 X 11H 3 Lu nw ow v M P I P. B. BOSWORTH. CORE FOR PNEUMATIC TIRES AND METHOD OF CONSTRUCTING SAME. APPLICATION FILED JULY 8| 1920. i 1,409,99 Patented Mar. 21, 1922.

3 SHEETS-SHEET 2.

P. B. BOSWORTH. I CORE FOR'PNEUMATH) TIRES AND METHOD OF CONSTRUCTING SAME.

APPLICATION FILED JULY 8. I920.

3 SHEETS-SHEET 3- 1' (raw/1. m it ay copcjemq k Be it known that 1, Benny, B. Bosworrrn,

PATENT- OFFICE.

[PERCY B. oswoRrH, or seamen-ELI), 01110.

oonnron rnncivm rio TIRES AND r/rn'rn'on or CONSTRUCTING s um.

a citizen of the "United States, residing at Springfieldpin theycounty of Clark and State of Ohio, have invented certain new andfuseiul Improvements in Cores for Pneuina tic', i ires and .Methods of Constructing Same, of which the following is, a spec fication. g j My invention relates toiniprovements 1n the method of making andlin the construc- I method and construction ,0f the characterreferred to .which'will enable me to build I 22 of Fig. 1.

tionlof cores for pneumatic tires,,it relating moreparticularly to buildingcores for the casings of such tires. An object of my invention is to provide a acore which will be light in weight but at the same time of ample, strength for the uses to which it is subjected. i v i -A. further object of the invention is the construction of a metal core of a collapsible character, thesections of which have overlapping ends, the parts of which sections may be more accurately and conven ently vformed and assembled than has heretofore been the practice in the manufacture of cores of this character. j v r l i A. further object of the invention is to provide a construction of cores of a sectional overlapping character which will per.- mit the sections to be vreadily collapsed and removed from the tire casing.

A further object of the invention: is to provide a core which will be simple in its construction, effective in its operation and economical in manufacture; i

Fig. 1 is;.a side View of;a -core in assembled condition embodying my improvements. i I Y Fig. 2 is a section of the same on the line Fig. 8 is a side view f the'difierent finished sections of the core in unassembled condition. 1

:Fig. 4 is a view of the inner side of onehalf of one of the ring castings after being sawed int-o sections. i 1

The core is first cast in two continuous halves or rings, one of; which is shown in Fig. 4 of a'shape in'cross section asillustratedv in Fig. 2. Each ring, after being turned and planed is then sawed into sections, a. a a and a representlng the sections of the ringshown in Fig. 4, while I),

Specification of Letters Patent. Patented Ma 21 1922 Application ,fii a July 3 e, 1920. Serial no. 394,710. a

offconveniently explaining the construction arrangement, the sections a and b, will be referred to as top sections,- those a and b ras the left hand side sections, those a and b as therighthand side sections, and theories a and b asthe bottom sections, as the sections all appear in this'position in the drawings after being/assembled. The cuts madeby the saw are represented by the characters 1, 2, 3, and 4:. The cuts 1 and 2 extend at a slight angle to the vertical center line and at different distances therefrom, as shown in Fig. 4:, the angles of the cuts being such that the sections a and b-will be slightly wedge-shaped with the outer peripheries of less length than the inner peripheries. The cuts 3 and 4 arealso made at different distances from the vertical center line,these cuts being. on lines which, if extended, would lie at one side of the center of the finished core. The main body of the two sections, when assembled, will have a contour conforming to the contour of the interior of a tire casing andeach section has an inwardly projecting flange f. 1 ,When thesections'of the respective rings are lying together with their inner faces abutting, and with the imaginary vertical center lines of each ring coinciding, it will be seen that the sections a and I) become mates as well as the sections a and b and, due to the fact that the cuts have been made in the manner described, the ends of there spective mating sections will .project beyond each other. In like manner the sectiona mates with the section 6 with the ends of b -projecting beyond the ends of a and the section a lmates withb with the ends of a projecting beyond the ends of 6 as a result of the manner of cutting the sectionsbefore described. The respectlve mating sections are then permanently secured together bv rivets e.

The flanges f of the sections of one of the rings, in the present case those a, a a and a are provided with circularly-arranged, laterally-extending tongues t, while the flanges of the sections of the other ring have corresponding circularly-arranged grooves g.

The core sections thus formed when placed together will have overlapping ends and are temporarily secured together by screws 3 which project through openings 6 in the proper strength. By sawing overlapping portions of thering sections 6, b, b and b and are threaded in openings 8 in the overlapping e I of the ring a, a a and a, with t e tongues t projecting into the gppwas ,g, ,1 ,7 ,7

In collapsing the core after the tire ca has ,been completed, the screws 8 are remov andthesections a and b forcedinwardly, after which the side section'smay be remo and then the top and bottom sections. v .,-By the construction described; whereby the core is first cast in two halves'o'r a considerable saving of material is e'fiecte for the reason that when casting the entire core integrally it was necessary to give to the walls of the core an unusual and unnecessary thicknesstoallow for the floating movementof the sand-core in casti whereas by mgr-method; the walls of the core'ma'y be cast of any desired thickness so that they be as light as possible consistent wit the rings or hives thus cast before securing the, mating core sections together, the sawingoperation is not only more conveniently and econom cally performed, but'alsogreater accuracy ma{v 'be'secured in giving the proper size d1-- ametrical'ly and shape cirmmfeientially to the completed core, when constructing ai core of the diar'acterwhere the completed sections lire formed in two halves with overlapping ends. To further carry out ths accuracy in sizse and circumferential form, 1 so position the screw openings 8" and a as to lea've'th'e completed assembled core ofthe same diameter and circumferential shape as that of each of the ringsafter finished but before being sawed into sections. While such a construction will leave uniform aces'betweenjthe abutting-ends of the se'c tions of each half of the core equal to' the amount of metal removed by the sawing'oporation, such spaces are not detrimental in a building core sudi as my core is cspeci a'll designed to be. Theses'paces also make it easier to separate the top a and b in collapsing the core.

- By having the inner en 'ng parts between the flanges as descrlbed', that is, the tongues and grooves, a considerable-amount of the strain incident to the use of these cores is removed from the fastening screws as well as the rivets which secure the matin sections together, and these tongues grooves also assist in maintaining theproper contour and size of the finished core, it only being necessary in drilling the screw openings to see that the. spaces between adjacent ends of the sections are uniform.

In castingthe'rings strengthening ribs r are preferably formed on the interior walls of the rings,and the cuts are made through some of these ribs, which are of double width as shown. 1

. top'secti'ons wil form' mates as'wifl a "Having thus described my invention, I claim l. The methodoiconstructing cores for pneumatic tires consisting in first casting the same into two separate comailmous rlngs, sawing each ring in a manner to correspond to the ring into p ten. a d tw side sections so as to have the sections on one side of the riiig's of greater length than those at the other side placin the inner, faces of therings to so that the res "t e respective bottom sections, withftihe leftside section of one ri mating with the side section of the ot er ring,'and then permanentl securing the matingt'og'ether. 21 'e method of forrninga corevfor pneumati'c tires, consisting in first casting the same into two continuous rings, sawing each of said rings into four sections in a corresponding manner with the other ring, the saw cutsof each ring 'being on line: located at difierent distances from a vertical center line, placin the inner faces of together so t at thevertical center iines of said rings will coincide, and then rmanentl securing mating sections toget r and prov ing: temporary fastening means for the overlappingends said core is assembled. I v

3. The method of constnictin a core for pneumatic tires consisting in rat casting the same in two separate continuum sawingtl-ie rings into four top, bottom and'side sections on'linesloca at diflerent from a vertical center line, placing the respective ring-sections'together and permanently unitingmating sections, and providing tem 'ary fasteni devices for overlapping enxs it points whi dfi will maintainthe original diameter and circumferential conformation of'th'e rings before cutting. Y Y Y 4. In acollapsible core of the character described, two rings each-cast with a hollow body portion and an interior flan and'then divided by sawing into a plural ty o'fsections so arranged that whenthe inner faces of the-rings are placed together the sections of the respective rings will overlap for permanently securing m sting together, and temporary devices for securing the overlapping ends togeti-lensaid temporary devices beingso positioned as'to maintain in the finished core the same diameter and circumferential conformation as of the rings before being divided into sections, leaving-a space between adjacent ends of the res ive sections. a

n testimony wheneof l have hereunto set my hand this 12th day oiMa 1 920.-

1 PERCY B. B SWORTH. Witness; CHAS. I. WM. 

